feat: 完善差旅票据行程提取与费用明细回填逻辑

增强文档智能识别的票据场景关键词和字段提取能力，优化
会话关联草稿报销单的解析路径，修复费用明细合并和票据
去重边界问题，前端改进报销创建和审批详情交互，补充单
元测试覆盖。

web/src/views/scripts/TravelRequestDetailView.js

@@ -50,16 +50,14 @@ const EXPENSE_TYPE_OPTIONS = [
 
 const LOCATION_REQUIRED_EXPENSE_TYPES = new Set([
   'travel',
-  'train_ticket',
-  'flight_ticket',
-  'hotel_ticket',
-  'ride_ticket',
   'meeting',
   'entertainment'
 ])
 
 const SYSTEM_GENERATED_EXPENSE_TYPES = new Set(['travel_allowance'])
 const LONG_DISTANCE_TRAVEL_EXPENSE_TYPES = new Set(['train_ticket', 'flight_ticket'])
+const ROUTE_DESCRIPTION_EXPENSE_TYPES = new Set(['train_ticket', 'flight_ticket', 'ride_ticket'])
+const ROUTE_DESCRIPTION_PATTERN = /^[A-Za-z0-9\u4e00-\u9fa5（）()·]{2,40}\s*-\s*[A-Za-z0-9\u4e00-\u9fa5（）()·]{2,40}$/
 
 function parseCurrency(value) {
   return Number.parseFloat(String(value).replace(/[^\d.]/g, '')) || 0
@@ -103,6 +101,23 @@ function resolveLocationDisplay(value, expenseType) {
   return isPlaceholderValue(value) ? '待补充' : value
 }
 
+function isRouteDescriptionExpenseType(value) {
+  return ROUTE_DESCRIPTION_EXPENSE_TYPES.has(normalizeExpenseType(value))
+}
+
+function isValidRouteDescription(value) {
+  const text = String(value || '').trim()
+  return ROUTE_DESCRIPTION_PATTERN.test(text) && !/\d{4}[-/年.]\d{1,2}[-/月.]\d{1,2}/.test(text)
+}
+
+function resolveExpenseReasonPlaceholder(itemType) {
+  return isRouteDescriptionExpenseType(itemType) ? '始发地-目的地，例如：广州南-北京南' : '输入费用说明'
+}
+
+function resolveExpenseReasonHelper(itemType) {
+  return isRouteDescriptionExpenseType(itemType) ? '始发地-目的地' : '业务报销说明'
+}
+
 function buildFallbackProgressSteps() {
   return [
     { index: 1, label: '创建单据', time: '已完成', done: true, active: true },
@@ -368,6 +383,8 @@ function buildExpenseDraftIssues(item) {
   }
   if (isPlaceholderValue(item.itemReason)) {
     issues.push('缺少说明')
+  } else if (isRouteDescriptionExpenseType(item.itemType) && !isValidRouteDescription(item.itemReason)) {
+    issues.push('行程说明格式错误')
   }
   if (locationRequired && isPlaceholderValue(item.itemLocation)) {
     issues.push('缺少地点')
@@ -464,6 +481,9 @@ function mapIssueToAdvice(issue) {
   if (fieldText === '缺少说明') {
     return `${labelPrefix}的用途说明。`
   }
+  if (fieldText === '行程说明格式错误') {
+    return `${labelPrefix}的行程说明，格式应为“始发地-目的地”。`
+  }
   if (fieldText === '缺少地点') {
     return `${labelPrefix}的业务地点。`
   }
@@ -1042,6 +1062,12 @@ export default {
       if (isPlaceholderValue(expenseEditor.itemReason)) {
         return '请输入费用说明。'
       }
+      if (
+        isRouteDescriptionExpenseType(expenseEditor.itemType)
+        && !isValidRouteDescription(expenseEditor.itemReason)
+      ) {
+        return '行程说明格式应为“始发地-目的地”，例如：广州南-北京南。'
+      }
 
       const amount = Number(expenseEditor.itemAmount)
       if (!Number.isFinite(amount) || amount <= 0) {
@@ -1325,6 +1351,10 @@ export default {
     }
 
     async function saveExpenseEdit(item) {
+      if (actionBusy.value) {
+        toast(uploadingExpenseId.value ? '附件识别中，请等待识别完成后再保存。' : '当前操作处理中，请稍后再保存。')
+        return
+      }
       if (!request.value.claimId) {
         toast('当前草稿缺少 claimId，暂时无法保存费用明细。')
         return
@@ -1666,6 +1696,8 @@ export default {
           resolveAttachmentDisplayName,
           resolveAttachmentPreviewTitle,
           resolveAttachmentRecognition,
+          resolveExpenseReasonHelper,
+          resolveExpenseReasonPlaceholder,
           resolveExpenseRiskState,
           resolveExpenseIssues,
       returnBusy,